Cisco Certified Network Associate (CCNA) Practice Exam

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What is the maximum number of virtual router groups possible with GLBP?

512
1,024
2,048
4,096

The correct answer is: 1,024

Gateway Load Balancing Protocol (GLBP) allows multiple routers to form a virtual router group that load-balances traffic among them. This protocol is specifically designed to provide redundancy and load balancing for end devices on a network. The maximum number of virtual router groups that can be configured in GLBP is 1,024. This number enables a significant level of scalability in networks that require multiple groups for efficient load distribution and failover capabilities. Each of these virtual router groups can consist of up to four active virtual forwarders (AVFs), allowing for effective resource utilization and resilience against router failures. Understanding the architecture and limits of GLBP is essential for network design, particularly in environments with high traffic demands or where redundancy is critical. By utilizing the appropriate number of virtual router groups, network administrators can optimize performance and reliability across their routing infrastructure.